diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index 0000b498f89..3eaf4e1131f 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -2240,7 +2240,9 @@ aarch64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_get_syscall_number (gdbarch, aarch64_linux_get_syscall_number);
 
   /* Displaced stepping.  */
-  set_gdbarch_max_insn_length (gdbarch, 4 * AARCH64_DISPLACED_MODIFIED_INSNS);
+  set_gdbarch_max_insn_length (gdbarch, 4);
+  set_gdbarch_displaced_step_max_buffer_length
+    (gdbarch, 4 * AARCH64_DISPLACED_MODIFIED_INSNS);
   set_gdbarch_displaced_step_copy_insn (gdbarch,
 					aarch64_displaced_step_copy_insn);
   set_gdbarch_displaced_step_fixup (gdbarch, aarch64_displaced_step_fixup);
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index b64c21ce68f..d1941992c77 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -10662,7 +10662,9 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* Note: for displaced stepping, this includes the breakpoint, and one word
      of additional scratch space.  This setting isn't used for anything beside
      displaced stepping at present.  */
-  set_gdbarch_max_insn_length (gdbarch, 4 * ARM_DISPLACED_MODIFIED_INSNS);
+  set_gdbarch_displaced_step_max_buffer_length
+    (gdbarch, 4 * ARM_DISPLACED_MODIFIED_INSNS);
+  set_gdbarch_max_insn_length (gdbarch, 4);
 
   /* This should be low enough for everything.  */
   tdep->lowest_pc = 0x20;
diff --git a/gdb/displaced-stepping.c b/gdb/displaced-stepping.c
index 06b32a80f6a..72b6366390f 100644
--- a/gdb/displaced-stepping.c
+++ b/gdb/displaced-stepping.c
@@ -55,7 +55,7 @@ displaced_step_buffers::prepare (thread_info *thread, CORE_ADDR &displaced_pc)
   regcache *regcache = get_thread_regcache (thread);
   const address_space *aspace = regcache->aspace ();
   gdbarch *arch = regcache->arch ();
-  ULONGEST len = gdbarch_max_insn_length (arch);
+  ULONGEST len = gdbarch_displaced_step_max_buffer_length (arch);
 
   /* Search for an unused buffer.  */
   displaced_step_buffer *buffer = nullptr;
@@ -243,7 +243,7 @@ displaced_step_buffers::finish (gdbarch *arch, thread_info *thread,
      below.  */
   thread->inf->displaced_step_state.unavailable = false;
 
-  ULONGEST len = gdbarch_max_insn_length (arch);
+  ULONGEST len = gdbarch_displaced_step_max_buffer_length (arch);
 
   /* Restore memory of the buffer.  */
   write_memory_ptid (thread->ptid, buffer->addr,
@@ -302,7 +302,7 @@ displaced_step_buffers::restore_in_ptid (ptid_t ptid)
 
       regcache *regcache = get_thread_regcache (buffer.current_thread);
       gdbarch *arch = regcache->arch ();
-      ULONGEST len = gdbarch_max_insn_length (arch);
+      ULONGEST len = gdbarch_displaced_step_max_buffer_length (arch);
 
       write_memory_ptid (ptid, buffer.addr, buffer.saved_copy.data (), len);
 
diff --git a/gdb/gdbarch-gen.h b/gdb/gdbarch-gen.h
index ddb97f60315..76d12a15317 100644
--- a/gdb/gdbarch-gen.h
+++ b/gdb/gdbarch-gen.h
@@ -1039,8 +1039,8 @@ extern void set_gdbarch_max_insn_length (struct gdbarch *gdbarch, ULONGEST max_i
    see the comments in infrun.c.
 
    The TO area is only guaranteed to have space for
-   gdbarch_max_insn_length (arch) bytes, so this function must not
-   write more bytes than that to that area.
+   gdbarch_displaced_step_buffer_length (arch) octets, so this
+   function must not write more octets than that to this area.
 
    If you do not provide this function, GDB assumes that the
    architecture does not support displaced stepping.
@@ -1122,6 +1122,14 @@ typedef void (gdbarch_displaced_step_restore_all_in_ptid_ftype) (inferior *paren
 extern void gdbarch_displaced_step_restore_all_in_ptid (struct gdbarch *gdbarch, inferior *parent_inf, ptid_t child_ptid);
 extern void set_gdbarch_displaced_step_restore_all_in_ptid (struct gdbarch *gdbarch, gdbarch_displaced_step_restore_all_in_ptid_ftype *displaced_step_restore_all_in_ptid);
 
+/* The maximum length in octets required for a displaced-step instruction
+   buffer.  By default this will be the same as gdbarch::max_insn_length,
+   but should be overridden for architectures that might expand a
+   displaced-step instruction to multiple replacement instructions. */
+
+extern ULONGEST gdbarch_displaced_step_buffer_length (struct gdbarch *gdbarch);
+extern void set_gdbarch_displaced_step_buffer_length (struct gdbarch *gdbarch, ULONGEST displaced_step_buffer_length);
+
 /* Relocate an instruction to execute at a different address.  OLDLOC
    is the address in the inferior memory where the instruction to
    relocate is currently at.  On input, TO points to the destination
diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
index efd111eeabc..8cb307d39c9 100644
--- a/gdb/gdbarch.c
+++ b/gdb/gdbarch.c
@@ -192,6 +192,7 @@ struct gdbarch
   gdbarch_displaced_step_finish_ftype *displaced_step_finish = NULL;
   gdbarch_displaced_step_copy_insn_closure_by_addr_ftype *displaced_step_copy_insn_closure_by_addr = nullptr;
   gdbarch_displaced_step_restore_all_in_ptid_ftype *displaced_step_restore_all_in_ptid = nullptr;
+  ULONGEST displaced_step_buffer_length = 0;
   gdbarch_relocate_instruction_ftype *relocate_instruction = NULL;
   gdbarch_overlay_update_ftype *overlay_update = nullptr;
   gdbarch_core_read_description_ftype *core_read_description = nullptr;
@@ -463,6 +464,10 @@ verify_gdbarch (struct gdbarch *gdbarch)
     log.puts ("\n\tdisplaced_step_finish");
   /* Skip verify of displaced_step_copy_insn_closure_by_addr, has predicate.  */
   /* Skip verify of displaced_step_restore_all_in_ptid, invalid_p == 0 */
+  if (gdbarch->displaced_step_buffer_length == 0)
+    gdbarch->displaced_step_buffer_length = gdbarch->max_insn_length;
+  if (gdbarch->displaced_step_buffer_length < gdbarch->max_insn_length)
+    log.puts ("\n\tdisplaced_step_buffer_length");
   /* Skip verify of relocate_instruction, has predicate.  */
   /* Skip verify of overlay_update, has predicate.  */
   /* Skip verify of core_read_description, has predicate.  */
@@ -1121,6 +1126,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
   gdb_printf (file,
 	      "gdbarch_dump: displaced_step_restore_all_in_ptid = <%s>\n",
 	      host_address_to_string (gdbarch->displaced_step_restore_all_in_ptid));
+  gdb_printf (file,
+	      "gdbarch_dump: displaced_step_buffer_length = %s\n",
+	      plongest (gdbarch->displaced_step_buffer_length));
   gdb_printf (file,
 	      "gdbarch_dump: gdbarch_relocate_instruction_p() = %d\n",
 	      gdbarch_relocate_instruction_p (gdbarch));
@@ -4169,6 +4177,24 @@ set_gdbarch_displaced_step_restore_all_in_ptid (struct gdbarch *gdbarch,
   gdbarch->displaced_step_restore_all_in_ptid = displaced_step_restore_all_in_ptid;
 }
 
+ULONGEST
+gdbarch_displaced_step_buffer_length (struct gdbarch *gdbarch)
+{
+  gdb_assert (gdbarch != NULL);
+  /* Check variable is valid.  */
+  gdb_assert (!(gdbarch->displaced_step_buffer_length < gdbarch->max_insn_length));
+  if (gdbarch_debug >= 2)
+    gdb_printf (gdb_stdlog, "gdbarch_displaced_step_buffer_length called\n");
+  return gdbarch->displaced_step_buffer_length;
+}
+
+void
+set_gdbarch_displaced_step_buffer_length (struct gdbarch *gdbarch,
+					  ULONGEST displaced_step_buffer_length)
+{
+  gdbarch->displaced_step_buffer_length = displaced_step_buffer_length;
+}
+
 bool
 gdbarch_relocate_instruction_p (struct gdbarch *gdbarch)
 {
diff --git a/gdb/gdbarch_components.py b/gdb/gdbarch_components.py
index 1eef2fb584e..58fba1aea71 100644
--- a/gdb/gdbarch_components.py
+++ b/gdb/gdbarch_components.py
@@ -1739,8 +1739,8 @@ For a general explanation of displaced stepping and how GDB uses it,
 see the comments in infrun.c.
 
 The TO area is only guaranteed to have space for
-gdbarch_max_insn_length (arch) bytes, so this function must not
-write more bytes than that to that area.
+gdbarch_displaced_step_buffer_length (arch) octets, so this
+function must not write more octets than that to this area.
 
 If you do not provide this function, GDB assumes that the
 architecture does not support displaced stepping.
@@ -1848,6 +1848,20 @@ contents of all displaced step buffers in the child's address space.
     invalid=False,
 )
 
+Value(
+    comment="""
+The maximum length in octets required for a displaced-step instruction
+buffer.  By default this will be the same as gdbarch::max_insn_length,
+but should be overridden for architectures that might expand a
+displaced-step instruction to multiple replacement instructions.
+""",
+    type="ULONGEST",
+    name="displaced_step_buffer_length",
+    predefault="0",
+    postdefault="gdbarch->max_insn_length",
+    invalid="gdbarch->displaced_step_buffer_length < gdbarch->max_insn_length",
+)
+
 Method(
     comment="""
 Relocate an instruction to execute at a different address.  OLDLOC
diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index e6ce13a1c67..ce48515d8ca 100644
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -2603,7 +2603,7 @@ linux_displaced_step_prepare (gdbarch *arch, thread_info *thread,
 	 at DISP_STEP_BUF_ADDR.  They are all of size BUF_LEN.  */
       CORE_ADDR disp_step_buf_addr
 	= linux_displaced_step_location (thread->inf->gdbarch);
-      int buf_len = gdbarch_max_insn_length (arch);
+      int buf_len = gdbarch_displaced_step_max_buffer_length (arch);
 
       linux_gdbarch_data *gdbarch_data = get_linux_gdbarch_data (arch);
       gdb_assert (gdbarch_data->num_disp_step_buffers > 0);
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 104515de030..9fc4574bb41 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -889,7 +889,8 @@ ppc_displaced_step_copy_insn (struct gdbarch *gdbarch,
 			      CORE_ADDR from, CORE_ADDR to,
 			      struct regcache *regs)
 {
-  size_t len = gdbarch_max_insn_length (gdbarch);
+  size_t len = gdbarch_displaced_step_max_buffer_length (gdbarch);
+  gdb_assert (len > PPC_INSN_SIZE);
   std::unique_ptr<ppc_displaced_step_copy_insn_closure> closure
     (new ppc_displaced_step_copy_insn_closure (len));
   gdb_byte *buf = closure->buf.data ();
@@ -8363,8 +8364,9 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_displaced_step_finish (gdbarch, ppc_displaced_step_finish);
   set_gdbarch_displaced_step_restore_all_in_ptid
     (gdbarch, ppc_displaced_step_restore_all_in_ptid);
+  set_gdbarch_displaced_step_max_buffer_length (gdbarch, 2 * PPC_INSN_SIZE);
 
-  set_gdbarch_max_insn_length (gdbarch, 2 * PPC_INSN_SIZE);
+  set_gdbarch_max_insn_length (gdbarch, PPC_INSN_SIZE);
 
   /* Hook in ABI-specific overrides, if they have been registered.  */
   info.target_desc = tdesc;
